Check out this video showing three amazing creations by master origamist Satoshi Kamiya. Hard to believe, but each of the pieces shown in this video was folded from a single sheet of paper.

The red dragon, made from a 1.2 x 1.2 meter sheet, took only 6 hours to fold. The yellow hornet was commissioned by luxury retailer Hermes and was put on display in their New York store. The white dragon is fashioned from a 2 x 2 meter sheet of paper. "As far as I know, it is the most complex origami in the world," says Kamiya in the video.

Lisa

washi

Any art supplies shop should have A0 paper which is approx 1.2 x 0.8 metres, however for 1.2m square you would need to get the special 2A0 paper which is twice that size (1.2x1.7m) then cut it down to a square. I don't know how common 2A0 paper is, I've not noticed anyone selling it.
See http://en.wikipedia.org/wiki/Paper_size

master

master

Your origami is the best it is so 3D how u do that?that paper u used was so big u r so talented!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!